Vehicle stability control system

Abstract

A vehicle stability control system includes a base required driving force calculation unit, an estimated driving force estimation unit, and a required driving force correction unit. The base required driving force calculation unit calculates a physical quantity to generate the base required driving force at a driving wheel. The estimated driving force estimation unit estimates a driving force as being generated in the vehicle. The required driving force correction unit obtains a correction to suppress a potential pitching vibration in the vehicle. The physical quantity calculated by the base required driving force calculation unit is corrected on the basis of the correction. The corrected required driving force obtained by the required driving force correction unit is generated at the driving wheel.

1. A vehicle stability control system comprising:
 a base required driving force calculation unit that calculates a physical quantity corresponding to a base required driving force desired by a driver to generate the base required driving force at a driving wheel of a vehicle; 
 an estimated driving force estimation unit that obtains a physical quantity corresponding to an estimated driving force that is estimated as being generated in the vehicle; and 
 a required driving force correction unit that obtains a corrected required driving force in such a way that a fluctuation of a front or rear wheel contact load occurring in the vehicle when the estimated driving force is generated is obtained on the basis of the physical quantity corresponding to the estimated driving force, a correction to reduce a derivative term of the fluctuation of the front or rear wheel contact load is obtained, and the physical quantity corresponding to the base required driving force calculated by the base required driving force calculation unit is corrected on the basis of the correction, 
 wherein the corrected required driving force obtained by the required driving force correction unit is generated at the driving wheel. 
 
     
     
       2. The vehicle stability control system according to  claim 1 , wherein the required driving force correction unit has an equation of state describing state quantities of the vehicle on the basis of an on-spring body model of the vehicle and an output equation describing the derivative term of the fluctuation of the front or rear wheel contact load with the state quantities on the basis of the equation of state, and the physical quantity corresponding to the base required driving force is corrected so as to reduce the derivative term of the fluctuation of the front or rear wheel contact load obtained from the output equation and the state quantities.